Furnace



FIG. 1 is a perspective view of the furnace of our new design;

FIG. 2 is a front view of the furnace of FIG. 1;

FIG. 3 is a rear view of the furnace of FIG. 1;

FIG. 4 is a left side view of the furnace of FIG. 1;

FIG. 5 is a right side view of the furnace of FIG. 1; and,

FIG. 6 is a top view of the furnace of FIG. 1.

A bottom view is omitted as the bottom is flat and devoid of surface ornamentation.

The broken-line drawings in all views of the light are for environmental purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a furnace, as shown and described. 